20145355 has 16 divisors (see below), whose sum is σ = 25355520. Its totient is φ = 15336288.

The previous prime is 20145347. The next prime is 20145361. The reversal of 20145355 is 55354102.

It is a cyclic number.

It is not a de Polignac number, because 20145355 - 2³ = 20145347 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32236 + ... + 32854.

It is an arithmetic number, because the mean of its divisors is an integer number (1584720).

Almost surely, 2^20145355 is an apocalyptic number.

20145355 is a deficient number, since it is larger than the sum of its proper divisors (5210165).

20145355 is a wasteful number, since it uses less digits than its factorization.

20145355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20145355 is about 4488.3577174731. The cubic root of 20145355 is about 272.0977652812.

Adding to 20145355 its reverse (55354102), we get a palindrome (75499457).

The spelling of 20145355 in words is "twenty million, one hundred forty-five thousand, three hundred fifty-five".